Weak magnetic field effect in quark-gluon plasma

by Li Yan (Fudan University)

Tuesday 22 Apr 2025, 10:30 → 11:30 Asia/Shanghai

B105 (CHEP)

There must be electromagnetic fields created during high-energy heavy-ion collisions. However, as the quark-gluon plasma (QGP) starts to evolve hydrodynamically (around 1fm/c), these fields become very likely weak comparing to the energy scales of the strong interaction. In this talk, I will introduce the weak magnetic effect in the standard hydrodynamic formulation, which emerges in QGP close to local thermal equilibrium as the dissipative correction to the quark phase space distribution function. Although it is a small correction, we found that the weak magnetic field can be crucial to the anisotropic emission of direct photons (the direct photon puzzle), the polarization of thermal dilepton from QGP, and the sign change of local Lambda hyperon polarization.    

Brief introduction about the speaker:
Li Yan is currently an Assistant Professor at the Institute of Modern Physics, Fudan University. He obtained his PhD in 2013 from Stony Brook University. Afterward, he joined the Institut de Physique Théorique (IPhT) at Saclay, France, in 2013, and later the Department of Physics at McGill University in 2016 as a postdoctoral researcher. His research focuses on relativistic hydrodynamics and its application to quark-gluon plasma in high-energy heavy-ion collisions, the electromagnetic properties of quark-gluon plasma, and non-equilibrium systems.

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